/*
 * Copyright (c) 2022, Andreas Kling <andreas@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <LibWeb/Layout/InlineFormattingContext.h>

namespace Web::Layout {

class LineBuilder {
    AK_MAKE_NONCOPYABLE(LineBuilder);
    AK_MAKE_NONMOVABLE(LineBuilder);

public:
    LineBuilder(InlineFormattingContext&, LayoutState&, LayoutState::UsedValues& containing_block_used_values, CSSPixels containing_block_width, CSS::Direction, CSS::WritingMode);

    enum class ForcedBreak {
        No,
        Yes,
    };

    void break_line(ForcedBreak, Optional<CSSPixels> next_item_width = {});
    void append_box(Box const&, CSSPixels leading_size, CSSPixels trailing_size, CSSPixels leading_margin, CSSPixels trailing_margin);
    void append_text_chunk(TextNode const&, size_t offset_in_node, size_t length_in_node, CSSPixels leading_size, CSSPixels trailing_size, CSSPixels leading_margin, CSSPixels trailing_margin, CSSPixels content_width, CSSPixels content_height, RefPtr<Gfx::GlyphRun>);
    void append_static_position_marker(Box const&, bool preceded_by_inline_box_start_edges);
    void prepare_to_append_inline_content();
    void commit_pending_margin_before_float();
    void finish_current_line_before_block_level_box();
    void append_block_level_box(Box const&, CSSPixels block_bottom, CSSPixels block_bottom_margin);

    // Returns whether a line break occurred.
    bool break_if_needed(CSSPixels next_item_width)
    {
        if (should_break(next_item_width)) {
            break_line(LineBuilder::ForcedBreak::No, next_item_width);
            return true;
        }
        return false;
    }

    void update_last_line();

    void remove_last_line_if_empty();

    void set_trailing_whitespace_on_previous_line();

    CSSPixels current_block_offset() const { return m_current_block_offset; }

    void recalculate_available_space();
    CSSPixels ceiling_for_float_to_be_inserted_here(Box const&);
    void set_unbreakable_run_width_interrupted_by_float(CSSPixels width) { m_unbreakable_run_width_interrupted_by_float = width; }

    void did_introduce_clearance(CSSPixels);

private:
    void begin_new_line(bool increment_y, bool is_first_break_in_sequence = true, ForcedBreak = ForcedBreak::No);

    bool should_break(CSSPixels next_item_width);

    LineBox& ensure_last_line_box();

    InlineFormattingContext& m_context;
    LayoutState& m_layout_state;
    LayoutState::UsedValues& m_containing_block_used_values;
    AvailableSize m_available_width_for_current_line { AvailableSize::make_indefinite() };
    CSSPixels m_current_block_offset { 0 };
    CSSPixels m_max_height_on_current_line { 0 };
    CSSPixels m_unbreakable_run_width_interrupted_by_float { 0 };
    CSSPixels m_text_indent { 0 };
    bool m_text_indent_hanging : 1 { false };
    bool m_text_indent_each_line : 1 { false };
    CSS::Direction m_direction { CSS::Direction::Ltr };
    CSS::WritingMode m_writing_mode { CSS::WritingMode::HorizontalTb };

    bool m_last_line_needs_update { false };
    bool m_should_advance_to_last_line_box_bottom { false };
    bool m_current_line_committed_pending_margin { false };
    bool m_pending_margin_follows_block_level_box { false };
};

}